Tengo el siguiente módulo

public class LowerCaseRequest : IHttpModule {
     public void Init(HttpApplication context) {
         context.BeginRequest += new EventHandler(this.OnBeginRequest);
     }

     public void Dispose() { }

     public void OnBeginRequest(Object s, EventArgs e) {
         HttpApplication app = (HttpApplication)s;

         if (app.Context.Request.Url.ToString().ToLower().EndsWith(".aspx")) {
             if (app.Context.Request.Url.ToString() != app.Context.Request.Url.ToString().ToLower()) {
                 HttpResponse response = app.Context.Response;

                 response.StatusCode = (int)HttpStatusCode.MovedPermanently;
                 response.Status = "301 Moved Permanently";
                 response.RedirectLocation = app.Context.Request.Url.ToString().ToLower();
                 response.SuppressContent = true;
                 response.End();
             }
             if (!app.Context.Request.Url.ToString().StartsWith(@"http://zeeprico.com")) {
                 HttpResponse response = app.Context.Response;

                 response.StatusCode = (int)HttpStatusCode.MovedPermanently;
                 response.Status = "301 Moved Permanently";
                 response.RedirectLocation = app.Context.Request.Url.ToString().ToLower().Replace(@"http://zeeprico.com", @"http://www.zeeprico.com");
                 response.SuppressContent = true;
                 response.End();
             }
         }
     }
}

el web.config se parece a

<system.web>
  <httpModules>
      <remove name="WindowsAuthentication" />
      <remove name="PassportAuthentication" />
      <remove name="AnonymousIdentification" />
      <remove name="UrlAuthorization" />
      <remove name="FileAuthorization" />
      <add name="LowerCaseRequest" type="LowerCaseRequest" />
      <add name="UrlRewriter" type="Intelligencia.UrlRewriter.RewriterHttpModule, Intelligencia.UrlRewriter" />
      <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
</httpModules>
</system.web>

Funciona en mi PC con XP e IIS 5.1

pero en mi servidor web que ejecuta IIS7 y WS 2008 no funciona, por favor ayuda, no sé cómo resolver esto.

Gracias